Smoke-consuming furnace.



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H. L. PRICE & G. L CARTWRIGHT.

SMOKE CONSUMING FURNACE.

APPLICATION FILED 05011, 1913.

Patented Apr. 13, 1915.

2 SHEETS-SHEET 1.

H. L.'PR|CE & G. J. CARTWRIGHT. SMOKE CONSUMING FURNACE. APELICATIONFILED DEC. 1|. I913.

Patented Apn 13, 1915.

2 SHEETSSHEET 2.

INF. NORRIS PETERS CO ,PHOTD LITHO WASHINGTON, D C

nnrrnn s rarns rarnnr @FFTQFL HARRY LOWELL PRICE AND GEQRGE JOSEPHCARTVVRIGHT, OF SYDNEY, NEVT SOUTH WALES, AUSTRALIA.

SMOKE-CONSUMING FURNACE.

aisaaaa Application filed. December 11, 1913.

To all whom it may concern Be it known that we, HARRY LOWELL Pinon andGnonen Josnrn CARTWRIGHT, citizens of the Commonwealth of Australia,residing at Sydney, New South Wales, Australia, have invented a new anduseful Smoke-Consuming Furnace, of which the following is aspecification.

This invention relates to improvements in the means employed forperfecting the combustion of fuel in boiler and other furnaces, and forpreventing the emission of smoke from said furnaces, by means ofperforated air admission pipes and passages adapted to be regulatedexteriorly to the furnace, the said pipes and passages being suitablyproportioned to the grate area of the furnace, and by means of other airadmission pipes provided with regulator valves located exteriorly to thefurnace but communicating with an air passage formed in the bridge andhaving vents open to the combustion chamber, and, further, by the use ofa flame tube having its inlet in the furnace and its outlet in the formof a perforated ignition tube arranged Within the combustion chamberrelatively near to the air vents formed in the bridge and communicatingwith the combustion chamber. The said vents, communicating both with theair admission passages and the perforations in the ignition tube, aregraduated in dimension from small to the largest, in the terminaldirection of the pipe or passage with which they are associated. Theaggregate area of these vents or perforations will in all cases bear thesame proportion as the pipes or passages with which they are associated.The piercings of the air regulator valves are likewise proportionedrelatively to the area of the pipes with which they are associated. Bymeans of these regulator valves a careful adjustment of the air supplymay be obtained. That admitted over the furnace front, while insuringthe satisfactory combustion of fuel, also tends to keep the furnace doorcool, and that admitted through the bridge to the combustion chamber,passing both over the bridge from the furnace and through the flame tubeto the ignition tube, insures a commingling of heated air with theresultant gases, thereby preventing the accumulation of smoke.

Specification of Letters ?atent.

Patented Apr. 13, 1915..

Serial No. 805,959.

The invention is applicable to the many and varied forms of furnaces,such as the Babcock & VVilcoX type of boiler, and other forms ofmultitubular, locomotive, Cornish, Colonial, and jackass type of boilerfurnaces, and may be cheaply applied thereto without the necessity forextensive alterations.

Referring to the accompanying drawings: Figure 1 is a central verticalsectional elevation of a Babcock & Wilcox type of boiler, showingapplication of the invention thereto. Fig. 2 is a vertical sectionalelevation on line aa of Fig. 1, showing air regulating pipe and ventsover furnace door. Fig. 3 is a horizontal sectional plan on line b?) ofFig. 1, showing general arrangement of air regulated admission pipes,passages, vents, and flame and ignition tubes. Fig. 4: is a plan of theflame and ignition tubes as in Fig. 3, showing detail of construction.Fig. 5 is a central vertical sectional elevation of air regulator valveas used with air pipe over furnace door and air pipe in bridge. Fig. 6is an end elevation of air regulator valve. Fig. 7 is a sectionalelevation on line 00 of Fig. 1, enlarged, looking toward furnace door,and ash pit door, showing air regulating pipe with vents above furnacedoor. elevation on line cZcZ of Fig. 1, enlarged, showing vents infurnace bridge and flame and ignition tubes, with air regulator passageshown dotted. Fig. 9 is a side elevation of part of Fig. 1, enlarged,showing air regulator valves for admitting air above the furnace doorand into bridge, also arrangement of connections from flame pipe infurnace to ignition tube in combustion chamber.

The aforesaid figures of the drawing illustrate the application of theinvention to a Babcock & Wilcox type of boiler, in which the heatgenerated in the furnace A is caused to pass through the first nest oftubes and over the director plate B through the second nest of tubes,its downward direction being controlled by the baffle plate G anddirector plate D, entering the combustion chamber E and passing upwardthrough the third nest of tubes and downward to the outlet flue F, asindicated by the arrows (Fig. 1), a form of construction involving amore tortuous travel of the heat than in other types of Fig. 8 is asectional boilers where the heat simply passes over the bridge andquickly enters the combustion chamber.

In the brickwork above the furnace door frame G, a tubular passage H isprovided, having the air regulator valve I externally connected thereto,and perforations H H H and H, the latter communicating with the furnaceA and arranged for directing the air currents in a lengthwise directionwithin thefurnace. The proportional area of the passage H isapproximately one-three hundred and fiftieth (l/850) or thereabout ofthe grate area. The vents leading into the furnace, while in theiraggregate totaling the area of the passage H, are graduated, vent Hbeing the smallest and H the largest; This construction insures an evendistribution of the air across the furnace. By making the aggregate areaof these openings equal to the cross-sectional area of the passage weprevent or very greatly lessen obstruction to the flow of air throughthe latter. If they were all at one point, the discharge would bepractically as free as if both ends of the pipe were left quite open,one end being the inlet, the other the outlet, and though the holes atfirst are reached by the air successively and begin discharging oneafter the other all will discharge simultaneously when the current isonce established, so that there can be very little eddying or delay.

The flame tube J provides communication for some portion of the flame topass from the furnace and through the connecting pipe K to the ignitiontube L located within the combustion chamber E. This ignition tube L hasthe vertical perforations L L L L L L L, which, while in their aggregatetotaling the area of the tube L, are graduated, L being the smallest andL the largest. The advantage of the equality of the total area ofperforations L to L inclusive with that of the cross section of tube Lis Tubstantially the same as that of the air inets.

The location for the ignition tube L is at a sufficient distance in rearof the bridge M, and sufficiently below the perforations formed therein,to insure contact of the flame issuing from the ignition tube with theunburnt gases emanating from the furnace, thus insuring the practicalobliteration of smoke.

The bridge is provided with the air passage N, proportionedapproximately to one five hundredth (l/500) or thereabout of the gratearea, and externally fitted with an air regulator valve I similar in itsconstruction to that upon the tubular passage H, and vents N N N N N NN, for discharging the air into the combustion chamber, and graduated togive an even distribution of the air across the said combustion chamber.

Any desired number of vents may be used in connection with the tubesover furnace door, the ignition tube, or the bridge, according to thesize and type of furnace to which they may be adapted.

A simple form of construction is employed in the make up of the flameand ignition tubes by using ordinary screw threaded pipe and standardfittings. The tube J, inserted through the wall M is attached to the Tpiece J blocked at one of its openings with a screw threaded plug J Theconnecting pipe K unites that T piece to a similar T piece J which alsohas its other opening blocked with a screw threaded plug J The ignitiontube is then connected with the second T piece, and passed through thewall M into the combustion chamber. The plugs J provide means forinspecting and cleans ing the tube K.

The air regulator valves I are formed by using an ordinary standardscrew threaded cap having holes I therein, and provided with a boss 1pierced to receive a spindle I secured to the circular disk I" which issimilarly pierced with holes 1 adapted to coordinate with the holes P. Ascrew threaded handle I attached to said spindle, is the means forrotating the disk. The holes I in the screw threaded cap and I in thecircular disk, are proportioned more or less to three and one-third ofthe pipe area.

Having now described our invention, what we claim as new and desire tosecure by Letters Patent is 1. A steam-boiler furnace having acombustion chamber and provided with a flame tube extending from thefurnace proper to the said combustion chamber and a trans- "erseignition tube supplied by said flame tube within said combustionchamber, this ignition tube being provided with a longitudinal series ofdischarge holes increasing successively in area in the direction of flowand equaling in total area that of a cross section of said ignition tubesubstantially as set forth.

2. A steamboiler furnace having a combustion chamber and a bridge walland provided with a flame tube extending from the furnace proper to thesaid combustion chamber, and a transverse ignition tube within saidchamber having a series of discharge holes increasing in area in thedirection of flow and equaling in total area that of a cross-section ofsaid ignition tube, the said bridge wall being provided with alongitudinal air flue and with a series of discharge outlets feeding airto the combustion chamber adjacent to the ignition tube.

3. A steam boiler furnace having a combustion chamber and a bridge walland provided With a flame tube extending from the furnace proper to thesaid combustion chamber, and a transverse ignition tube Within saidchamber having a series of discharge holes, the said bridge Wall beingprovided with a longitudinal air flue and with a series of dischargeoutlets feeding air to the combufition chamber adjacent to the ignitiontu e.

In testimony whereof We have signed our 10 names to this specificationin the presence of tWo subscribing Witnesses.

HARRY LOWELL PRICE, GEORGE JOSEPH CARTWRIGHT.

Witnesses:

JOHN J. STONE, HARRY A. SMEDLEY.

(Topics of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents, Washington, D. G.

